130 lines
6.3 KiB
C
130 lines
6.3 KiB
C
/***********************************************************************
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Copyright (c) 2006-2011, Skype Limited. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of Internet Society, IETF or IETF Trust, nor the
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names of specific contributors, may be used to endorse or promote
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products derived from this software without specific prior written
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permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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***********************************************************************/
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#include "opus/opus_config.h"
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#include <stdlib.h>
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#include "opus/silk/float/main_FLP.h"
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#include "opus/silk/tuning_parameters.h"
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void silk_find_pitch_lags_FLP(
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silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
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silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */
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silk_float res[], /* O Residual */
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const silk_float x[], /* I Speech signal */
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int arch /* I Run-time architecture */
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)
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{
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opus_int buf_len;
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silk_float thrhld, res_nrg;
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const silk_float *x_buf_ptr, *x_buf;
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silk_float auto_corr[ MAX_FIND_PITCH_LPC_ORDER + 1 ];
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silk_float A[ MAX_FIND_PITCH_LPC_ORDER ];
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silk_float refl_coef[ MAX_FIND_PITCH_LPC_ORDER ];
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silk_float Wsig[ FIND_PITCH_LPC_WIN_MAX ];
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silk_float *Wsig_ptr;
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/******************************************/
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/* Set up buffer lengths etc based on Fs */
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/******************************************/
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buf_len = psEnc->sCmn.la_pitch + psEnc->sCmn.frame_length + psEnc->sCmn.ltp_mem_length;
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/* Safety check */
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silk_assert( buf_len >= psEnc->sCmn.pitch_LPC_win_length );
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x_buf = x - psEnc->sCmn.ltp_mem_length;
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/******************************************/
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/* Estimate LPC AR coeficients */
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/******************************************/
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/* Calculate windowed signal */
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/* First LA_LTP samples */
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x_buf_ptr = x_buf + buf_len - psEnc->sCmn.pitch_LPC_win_length;
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Wsig_ptr = Wsig;
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silk_apply_sine_window_FLP( Wsig_ptr, x_buf_ptr, 1, psEnc->sCmn.la_pitch );
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/* Middle non-windowed samples */
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Wsig_ptr += psEnc->sCmn.la_pitch;
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x_buf_ptr += psEnc->sCmn.la_pitch;
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silk_memcpy( Wsig_ptr, x_buf_ptr, ( psEnc->sCmn.pitch_LPC_win_length - ( psEnc->sCmn.la_pitch << 1 ) ) * sizeof( silk_float ) );
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/* Last LA_LTP samples */
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Wsig_ptr += psEnc->sCmn.pitch_LPC_win_length - ( psEnc->sCmn.la_pitch << 1 );
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x_buf_ptr += psEnc->sCmn.pitch_LPC_win_length - ( psEnc->sCmn.la_pitch << 1 );
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silk_apply_sine_window_FLP( Wsig_ptr, x_buf_ptr, 2, psEnc->sCmn.la_pitch );
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/* Calculate autocorrelation sequence */
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silk_autocorrelation_FLP( auto_corr, Wsig, psEnc->sCmn.pitch_LPC_win_length, psEnc->sCmn.pitchEstimationLPCOrder + 1 );
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/* Add white noise, as a fraction of the energy */
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auto_corr[ 0 ] += auto_corr[ 0 ] * FIND_PITCH_WHITE_NOISE_FRACTION + 1;
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/* Calculate the reflection coefficients using Schur */
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res_nrg = silk_schur_FLP( refl_coef, auto_corr, psEnc->sCmn.pitchEstimationLPCOrder );
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/* Prediction gain */
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psEncCtrl->predGain = auto_corr[ 0 ] / silk_max_float( res_nrg, 1.0f );
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/* Convert reflection coefficients to prediction coefficients */
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silk_k2a_FLP( A, refl_coef, psEnc->sCmn.pitchEstimationLPCOrder );
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/* Bandwidth expansion */
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silk_bwexpander_FLP( A, psEnc->sCmn.pitchEstimationLPCOrder, FIND_PITCH_BANDWIDTH_EXPANSION );
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/*****************************************/
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/* LPC analysis filtering */
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/*****************************************/
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silk_LPC_analysis_filter_FLP( res, A, x_buf, buf_len, psEnc->sCmn.pitchEstimationLPCOrder );
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if( psEnc->sCmn.indices.signalType != TYPE_NO_VOICE_ACTIVITY && psEnc->sCmn.first_frame_after_reset == 0 ) {
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/* Threshold for pitch estimator */
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thrhld = 0.6f;
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thrhld -= 0.004f * psEnc->sCmn.pitchEstimationLPCOrder;
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thrhld -= 0.1f * psEnc->sCmn.speech_activity_Q8 * ( 1.0f / 256.0f );
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thrhld -= 0.15f * (psEnc->sCmn.prevSignalType >> 1);
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thrhld -= 0.1f * psEnc->sCmn.input_tilt_Q15 * ( 1.0f / 32768.0f );
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/*****************************************/
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/* Call Pitch estimator */
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/*****************************************/
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if( silk_pitch_analysis_core_FLP( res, psEncCtrl->pitchL, &psEnc->sCmn.indices.lagIndex,
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&psEnc->sCmn.indices.contourIndex, &psEnc->LTPCorr, psEnc->sCmn.prevLag, psEnc->sCmn.pitchEstimationThreshold_Q16 / 65536.0f,
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thrhld, psEnc->sCmn.fs_kHz, psEnc->sCmn.pitchEstimationComplexity, psEnc->sCmn.nb_subfr, arch ) == 0 )
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{
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psEnc->sCmn.indices.signalType = TYPE_VOICED;
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} else {
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psEnc->sCmn.indices.signalType = TYPE_UNVOICED;
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}
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} else {
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silk_memset( psEncCtrl->pitchL, 0, sizeof( psEncCtrl->pitchL ) );
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psEnc->sCmn.indices.lagIndex = 0;
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psEnc->sCmn.indices.contourIndex = 0;
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psEnc->LTPCorr = 0;
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}
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}
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